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Commentary by Pigini

Corona Shielding for HVDC Line Insulators

June 16, 2018 • ARTICLE ARCHIVE, Commentary by Pigini, CoronaComments (0)

Power utilities and insulator manufacturers continue to express differing views as to the relative value of shielding electrodes in DC. Back in 1972, significant laboratory research had already been undertaken on the influence of shielding and grading electrodes on voltage distribution in AC as well as DC. Further investigations were later published. There...

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Ofil Systems

Revising IEC 60815

June 9, 2018 • ARTICLE ARCHIVE, Commentary by Pigini, Editorial Columns

Specifications contained in IEC 60815 “Selection and dimensioning of high-voltage insulators intended for use in polluted conditions” are the result of work going back to 2000 when international experts in WG11 first started to set up the documents. With...

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Dielectric Strength & Air Density

May 19, 2018 • ARTICLE ARCHIVE, Commentary by Pigini

While a number of atmospheric parameters affect the dielectric strength of external insulation, relative air density (δ) and absolute humidity are considered the most significant. Here, the focus is on the former, which plays a key role in developing...

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Application of Composite Insulators to HVDC Systems

Application of Composite Insulators to HVDC Systems

May 19, 2018 • ARTICLE ARCHIVE, Commentary by Pigini, Editorial Columns

As is long known, the design of insulation for DC transmission is much more demanding than for AC, particularly from the standpoint of pollution performance. Fig. 1 below, for example, derives from laboratory testing of ceramic insulators and plots unified...

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Insulator End of Life: Recycling vs. Disposal

Insulator End of Life: Recycling or Disposal

May 12, 2018 • ARTICLE ARCHIVE, Commentary by Pigini, Insulators

The focus when it comes to electrical products and components has traditionally been on quality and performance in service. Increasing public awareness of environmental issues, however, has now led both manufacturers and users to pay greater attention to the...

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Designing for Reliability or Resilience

January 13, 2018 • ARTICLE ARCHIVE, Commentary by Pigini

Projections on climate change confirm that power systems will be exposed to increasing threats of the type that jeopardize continuity and quality of supply. How best to respond to this evolving situation? Do we need to reinforce entire electric systems to...

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Assessing EHV & UHV Station Post Insulators

December 16, 2017 • ARTICLE ARCHIVE, Commentary by Pigini, Insulators

Developments in station post insulator technologies can help minimize arcing distances needed at busbars, disconnectors and similar apparatus and therefore contribute to more flexible substation design. In general, station posts can be optimized by using...

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‘Externalities’ of Overhead Power Lines

November 25, 2017 • ARTICLE ARCHIVE, Commentary by Pigini

Public opposition and growing environmental awareness now make identifying corridors for new overhead lines an increasingly complex process – especially near densely populated or sensitive areas. Given this, it has become important to examine methodologies...

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